Secondino

A kids' second hand shop - a fantastic concept in an expensive city like Hamburg!
The positives first - the bus stops right outside it, the staff is friendly - and speaks English - the have clothes and other things which you won't find in any other shops. The choice of goods is as diverse as an eBay search. They also buy your unwanted baby goods.
On the negative side, the shop is below street level so there are spiral stairs to get down and the inside of the shops is totally crammed - two things difficult to tackle wih a pram. Having said that, if you find yourself at the top of the stairs, you can ring a bell and a member of staff will help you carry your pram down.